smash hit

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smash hit (plural smash hits)

1. (idiomatic) Something that is tremendously popular or successful.

   The cookies, though soft and gooey, proved a smash hit at the party.

   • 1971, Library Journal, volume 96, page 1569:

     All undergraduate libraries have been a screaming success as study halls. The Undergraduate Library of the University of Michigan may be the smash hit of all time; the attendance in that library during 1968-69 was 1,899,000.